Battery cell including internal terminal laser welded to folded external connector tab
By adopting specific patch folding and laser welding techniques in the stacked structure of the battery cells, the space waste and welding instability caused by improper folding of the patch in the existing battery cells is solved, and a more compact design and more stable welding effect are achieved.
Patent Information
- Application Number
- CN202311855662.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-11-03
- Filing Date
- 2023-12-29
- Publication Date
- 2025-05-06
AI Technical Summary
During the laser welding of internal terminals on the connector wiring sheets, existing battery cells have problems such as improper folding of the wiring sheets, resulting in waste of space and unstable welding.
The laminated structure design is adopted, wherein the external connectors of the C cathode electrodes and the A anode electrodes include a plurality of first tabs and a second tab extending further away from it, the first internal terminals are welded to the folded second tab by laser welding, and the maximum utilization area and stable connection of the tabs are ensured through a specific folding method and welding position.
Through this design, the overall size of the battery cell is reduced, the tabs are folded and pasted are avoided, and the welding stability and overall performance of the battery cell are improved.
Smart Images
Figure CN119944248A_ABST
Abstract
Description
[0001] introduce
[0002] The information provided in this section is for the purpose of generally presenting the context of the present disclosure. From the description in this section, the work of the currently named inventors and the aspects of the description that may not constitute prior art at the time of filing should neither be explicitly nor implicitly admitted to be prior art of the present disclosure.
[0003] The present disclosure relates to battery cells, and more particularly to battery cells including internal terminals laser welded to folded external connector tabs.
[0004] An electric vehicle (EV), such as a battery electric vehicle (BEV), a hybrid vehicle, and / or a fuel cell vehicle, includes one or more motors and a battery system including one or more battery cells, modules, and / or battery packs. A power control system is used to control the charging and / or discharging of the battery system during charging and / or driving. Summary of the invention
[0005] Among various features, the present disclosure includes a battery cell comprising a stacked structure and a first internal terminal. The stacked structure includes: C cathode electrodes, each cathode electrode including a cathode current collector, a cathode active layer disposed on the cathode current collector, and an external connector extending from the cathode current collector; anode electrodes, each anode electrode including an anode current collector, an anode active layer disposed on the anode current collector, and an external connector extending from the anode current collector; and S separators, wherein C, A, and S are integers greater than one. Each external connector of one of the C cathode electrodes and the A anode electrodes includes a first tab and a second tab extending further than the first tab, the second tab being folded onto the first tab, and the first internal terminal being laser welded to the second tab.
[0006] In other features, N second tabs are folded onto R first tabs, where N and R are both integers, and where N is equal to or greater than R.
[0007] In other features, the first tab is folded toward the second tab.
[0008] In other features, each of the second tabs has a maximum length that is less than or equal to half a width of the stacked structure.
[0009] In other features, the first group of first terminal tabs are adjacent to the first group of second terminal tabs, and the first group of second terminal tabs are folded onto the first group of first terminal tabs along a first direction; the second group of first terminal tabs are adjacent to the second group of second terminal tabs, and the second group of second terminal tabs are folded onto the second group of first terminal tabs along a second direction, and the second direction is opposite to the first direction.
[0010] In other features, the first group of first tabs are laterally spaced and aligned with the second group of second tabs in a third direction perpendicular to both the first direction and the second direction; and the first group of second tabs are laterally spaced and aligned with the second group of first tabs in the third direction.
[0011] In other features, each of the external connectors of the other electrodes among the C cathode electrodes and the A anode electrodes includes a third tab and a fourth tab longer than the third tab, the fourth tab is folded onto the third tab, and the second internal terminal is laser welded to the fourth tab.
[0012] In other features, the first group of third terminal plates are adjacent to the first group of fourth terminal plates, and the first group of fourth terminal plates are folded onto the first group of third terminal plates along a first direction; the second group of third terminal plates are facing the second group of fourth terminal plates, and the second group of fourth terminal plates are folded onto the second group of third terminal plates along a second direction, and the second direction is opposite to the first direction.
[0013] In other features, the first inner terminal and the second inner terminal are on opposite ends of the stacked structure.
[0014] In other features, the battery cell includes: a housing; a first external terminal in contact with the first internal terminal; and a second external terminal in contact with the second internal terminal.
[0015] Among various features, the present disclosure includes a battery cell including a stacked structure and a first internal terminal. The stacked structure includes: C cathode electrodes, each cathode electrode including a cathode current collector, a cathode active layer disposed on the cathode current collector, and an external connector extending from the cathode current collector; anode electrodes, each anode electrode including an anode current collector, an anode active layer disposed on the anode current collector, and an external connector extending from the anode current collector; and S separators, wherein C, A, and S are integers greater than one. For one of the C cathode electrodes and the A anode electrodes, the external connector includes: a plurality of first terminal tabs and a plurality of second terminal tabs extending farther than the plurality of first terminal tabs; a first group of plurality of first terminal tabs and a first group of plurality of second terminal tabs, the first group of plurality of second terminal tabs being folded onto the first group of plurality of first terminal tabs along a first direction; a second group of plurality of first terminal tabs and a second group of plurality of second terminal tabs, the second group of plurality of second terminal tabs being folded onto the second group of plurality of first terminal tabs along a second direction, the second direction being opposite to the first direction; and a first internal terminal, which is laser welded to the first group of plurality of second terminal tabs and the second group of plurality of second terminal tabs.
[0016] In other features, the first plurality of first lugs are laterally spaced apart and aligned with the second plurality of second lugs; and the first plurality of second lugs are laterally spaced apart and aligned with the second plurality of first lugs.
[0017] In other features, the first plurality of first tabs are folded toward the first plurality of second tabs; and the second plurality of first tabs are folded toward the second plurality of second tabs.
[0018] In other features, for the other electrodes among the C cathode electrodes and the A anode electrodes, the external connector includes: a plurality of first terminal tabs and a plurality of second terminal tabs extending farther than the plurality of first terminal tabs; a first group of plurality of first terminal tabs and a first group of plurality of second terminal tabs, the first group of plurality of second terminal tabs being folded onto the first group of plurality of first terminal tabs along a first direction; a second group of plurality of first terminal tabs and a second group of plurality of second terminal tabs, the second group of plurality of second terminal tabs being folded onto the second group of plurality of first terminal tabs along a second direction, the second direction being opposite to the first direction; and a second internal terminal, which is laser welded to the first group of plurality of second terminal tabs and the second group of plurality of second terminal tabs.
[0019] In other features, each of the second plurality of tabs has a maximum length that is less than or equal to half a width of the stacked structure.
[0020] Among various features, the present disclosure includes a method for manufacturing a battery cell. The method includes providing a stacked structure, the stacked structure including: C cathode electrodes, each cathode electrode including a cathode current collector, a cathode active layer disposed on the cathode current collector, and an external connector extending from the cathode current collector; an anode electrode, each anode electrode including an anode current collector, an anode active layer disposed on the anode current collector, and an external connector extending from the anode current collector; a first group of multiple first tabs and a first group of multiple second tabs, the first group of multiple first tabs and the first group of multiple second tabs are included together with the external connector of one of the C cathode electrodes and the A anode electrodes, and the multiple second tabs extend further than the multiple first tabs; and S separators, wherein C, A, and S are integers greater than one. The method also includes folding the first group of multiple second tabs onto the first group of multiple first tabs along a first direction; and laser welding a first internal terminal to the first group of multiple second tabs.
[0021] In other features, the method includes folding the first plurality of first tabs toward the first plurality of second tabs in a second direction opposite to the first direction. After or simultaneously with folding the first plurality of first tabs in the second direction, the first plurality of second tabs are folded onto the first plurality of first tabs.
[0022] In other features, the method includes: providing a stacked structure including a third group of multiple third terminal tabs and a fourth group of multiple fourth terminal tabs, the third group of multiple third terminal tabs and the fourth group of multiple fourth terminal tabs being included together with external connectors of other electrodes among C cathode electrodes and A anode electrodes, and the multiple fourth terminal tabs extending farther than the multiple third terminal tabs; folding the fourth group of multiple fourth terminal tabs onto the third group of multiple third terminal tabs; and laser welding the second internal terminal to the fourth group of multiple fourth terminal tabs.
[0023] In other features, the method includes folding the third plurality of third tabs toward the fourth group. After folding the third group toward the fourth group, folding the fourth group onto the third group.
[0024] In other features, each of the second plurality of tabs has a maximum length that is less than or equal to half a width of the stacked structure.
[0025] Further areas of applicability of the present disclosure will become apparent from the detailed description, the claims and the accompanying drawings.The detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] The present disclosure will become more fully understood from the detailed description and accompanying drawings, in which:
[0027] Figure 1 is a side cross-sectional view of an exemplary battery cell;
[0028] Figure 2 is a perspective view of one example of a prismatic battery cell including a laser welded internal terminal in contact with an external terminal according to the present disclosure;
[0029] Figure 3 is a perspective view of one example of a prismatic battery cell including an electrode with a folded external connector tab to which an internal terminal is laser welded according to the present disclosure;
[0030] Figure 4A and 4B is a perspective view of a stacked structure of cathode electrodes, anode electrodes and external connector tabs before being folded and welded to internal terminals;
[0031] Figures 5A-5D is a side view illustrating an exemplary method for folding an external connector tab and laser welding one of the internal terminals to the folded external connector tab according to the present disclosure;
[0032] Figure 6is a perspective view showing laser welding of an internal terminal to a folded external connector tab; and
[0033] Figure 7 is a perspective view of one end portion of another stacked structure of a cathode electrode, an anode electrode, and an external connector tab according to the present disclosure.
[0034] Among the drawings, reference numerals may be repeated to identify similar and / or identical elements. DETAILED DESCRIPTION
[0035] Although battery cells including laser welded internal terminals according to the present disclosure are illustrated in the context of electric vehicles, battery cells including laser welded internal terminals may also be used in stationary applications and / or other applications.
[0036] Reference now Figure 1 , the battery cell 10 includes C cathode electrodes 20, A anode electrodes 40, and S separators 32 arranged in a predetermined order in a stacked structure 12 located in a housing 50. C, A, and S are all integers, and they are all greater than one. In some examples, A=C+1. The C cathode electrodes 20-1, 20-2, ..., and 20-C include a cathode active layer 24 arranged on one side or both sides of a cathode current collector 26. The A anode electrodes 40-1, 40-2, ..., and 40-A include an anode active layer 42 arranged on one side or both sides of an anode current collector 46.
[0037] Reference now Figure 2 , the prismatic battery cell 100 includes a housing 110. In some examples, the housing 110 has a rectangular cross-section. The prismatic battery cell 100 includes external terminals 112 and 114 and a vent cover 116. A stacked structure 115 of C cathode electrodes 20, A anode electrodes 40, and S separators 32 is disposed in the housing 110. As will be further described below, the anode current collector 46 and / or the cathode current collector 26 include external tabs that are laser welded to internal terminals that contact the external terminals 112 and 114 of the battery cell 10.
[0038] Reference now Figure 3 , the prismatic battery cell 200 includes a housing 210 and internal terminals 224 and 226 disposed at opposite ends of the housing 210. A stacked structure 240 of C cathode electrodes, A anode electrodes, and S separators is disposed in the housing 210. The cathode current collector and / or the anode current collector include external connector tabs 310 and 410 extending therefrom, respectively. As further described herein, the external connector tabs 310 and 410 are laser welded to the inner surfaces of the internal terminals 224 and 226, respectively.
[0039] Additional references Figure 4A and 4B , the stacked structure 240 is shown separated from the rest of the prismatic battery cell 200 and is before the internal terminals 224 and 226 are welded to the external connector tabs 310 and 410, respectively. Figure 4A and 4B In the example of , the external connector tab 310 includes a plurality of first tabs 310A and a plurality of second tabs 310B. The plurality of second tabs 310B extend further from the cathode current collector 26 than the plurality of first tabs 310A. Therefore, each of the plurality of second tabs 310B is longer than each of the plurality of first tabs 310A. For example, referring to Figure 4A , each of the plurality of second tabs 310B has a length L that is less than or equal to half of the width W of the stacked structure 240. As a result, when the plurality of second tabs 310B are folded onto the plurality of first tabs 310A in the manner described herein, the plurality of second tabs 310B do not extend beyond the width W of the stacked structure 240.
[0040] The stacked structure 240 includes at least two groups of first plurality of connecting pieces 310A and at least two groups of second plurality of connecting pieces 310B. Each group of the plurality of first connecting pieces 310A is adjacent to one of the groups of the plurality of second connecting pieces 310B. Figure 4A As shown, the stacked structure 240 includes a first group 312A of multiple first terminals 310A, which is adjacent to a first group 314A of multiple second terminals 310B. The stacked structure 240 also includes a second group 312B of multiple first terminals 310A, which is adjacent to a second group 314B of multiple second terminals 310B. The first group 312A of multiple first terminals 310A and the second group 314B of multiple second terminals 310B are laterally spaced and aligned. The first group 314A of multiple second terminals 310B and the second group 312B of multiple first terminals 310A are laterally spaced and aligned. This staggered arrangement of the first group 314A and the second group 314B of second terminals 310B ensures that the second terminals 310B of each electrode (C cathode electrodes 20 and A anode electrodes 40) are welded to the internal terminals 224 and 226, and the second terminals are folded on the first terminals 310A as described herein. The first set 312A and 314A are laterally spaced apart from the second set 312B and 314B in a direction perpendicular to the direction in which the second tab 310B is folded over the first tab 310A, as further described herein.
[0041] The number of second terminal tabs 310B included in the first group 314A of multiple second terminal tabs 310B is equal to or greater than the number of multiple first terminal tabs 310A included in the adjacent first group 312A. Similarly, the number of second terminal tabs 310B included in the second group 314B of multiple second terminal tabs 310B is equal to or greater than the number of multiple first terminal tabs 310A included in the adjacent second group 312B. In some applications, the number of second terminal tabs 310B can be more than the number of adjacent first terminal tabs 310A, for example, 3:2 times.
[0042] Continue to refer Figure 4A and 4B , the external connector tab 410 is configured in a similar manner to the external connector tab 310, but is located at the opposite end of the stacked structure 240. For example, the external connector tab 410 includes a plurality of first tabs 410A and a plurality of second tabs 410B. The plurality of second tabs 410B extend further from the anode current collector 46 than the plurality of first tabs 410A. Therefore, each of the plurality of second tabs 410B is longer than each of the plurality of first tabs 410A. For example, referring to Figure 4B , each of the plurality of second tabs 410B has a length L that is less than or equal to half of the width W of the stacked structure 240. The length L of the plurality of second tabs 410B is the same as or substantially similar to the length L of the plurality of second tabs 310B.
[0043] At the end of the stacked structure 240 including the external anode connector tab 410 is one or more groups of a plurality of first tabs 410A and one or more groups of a plurality of second tabs 410B. Each group of the plurality of first tabs 410A is adjacent to one of the groups of the plurality of second tabs 410B. For example, Figure 4B As shown, the stacked structure 240 includes a first group 412A of multiple first terminals 410A, which is adjacent to a first group 414A of multiple second terminals 410B. The stacked structure 240 also includes a second group 412B of multiple first terminals 410A, which is adjacent to a second group 414B of multiple second terminals 410B. The first group 412A of multiple first terminals 410A and the second group 414B of multiple second terminals 410B are laterally spaced apart and aligned. The first group 414A of multiple second terminals 410B and the second group 412B of multiple first terminals 410A are laterally spaced apart and aligned.
[0044] Before welding the internal (cathode) terminal 224 to the external (cathode) connector tab 310, and before welding the internal (anode) terminal 226 to the external (anode) connector tab 410, fold the external (cathode) connector tab 310 and the external (anode) connector tab 410. Figures 5A-5DAn exemplary method for folding a first group 312A of a plurality of first tabs 310A and folding a first group 314A of a plurality of second tabs 310B according to the present disclosure is shown. Figures 5A-5D The method can also be used to fold other groups of external connector tabs 310 and 410. More specifically, Figures 5A-5D The method can also be applied to fold the second group 312B / 314B, the first group 412A / 414A and the second group 412B / 414B. Figures 5A-5D The method can be used to fold any suitable number of additional sets of external connector tabs 310 and 410. For example, Figure 7 As shown, it can also be based on Figures 5A-5D or any other suitable method to fold and weld the third group 312C / 314C and the fourth group 312D / 314D.
[0045] like Figure 5A As shown, the first group 312A of the plurality of first tabs 310A is folded in a first direction toward the first group 314A of the plurality of second tabs 310B using a first actuator 510A. The first actuator 510A may be any suitable device configured to fold the plurality of first tabs 310A in a first direction, such as any suitable automated actuation arm, template, etc. Figure 5B The first actuator 510A is shown pressing against the first group 312A to fold the first group 312A in a first direction toward the first group 314A of the plurality of second tabs 310B.
[0046] refer to Figure 5C , after the first group 312A is folded, or simultaneously with the folding of the first group 312A, the second actuator 510B presses against and folds the first group 314A plurality of second terminal tabs 310B toward the first group 312A in a second direction opposite to the first direction. The second actuator 510B generally folds the first group 314A over the first group 312A plurality of first terminal tabs 310A. After the plurality of first terminal tabs 310A are folded in the first direction and the plurality of second terminal tabs 310B are folded in the second direction over the plurality of first terminal tabs 310A, the first actuator 510A and the second actuator 510B are removed. Reference Figure 5C , the L-shaped internal terminals 224 are then positioned on the first group 314A of the plurality of second terminal tabs 310B and laser welded thereto.
[0047] Additional references Figure 6, the L-shaped internal terminal 224 is also placed on the second group 314B multiple second terminal tabs 310B and laser welded thereto. The laser welding is performed using any suitable laser welding device 550. After the laser welding device 550 is working, the internal terminal 224 can be welded to the folded first group 314A and the second group 314B second terminal tabs 310B. The welding also welds the multiple second terminal tabs 310B of the first group 314A together, and also welds the multiple second terminal tabs 310B of the second group 314B together. The weld can be made deep enough to weld the multiple second terminal tabs 310B to the multiple first terminal tabs 310A. The weld can extend deeper to weld the multiple first terminal tabs 310A of the first group 312A together, and also weld the multiple first terminal tabs 310A of the second group 312B together. The weld is limited to the connector tabs 310 and 410 so as not to extend to the diaphragm 32. The L-shaped internal terminal 226 is welded to the external connector tab 410 in the same manner as described above with respect to the internal terminal 224 .
[0048] Although the terminals 224 and 226 are shown as having an L-shape, they may also have any other suitable shape. In addition, each of the terminals 224 and 226 may be made of a single or multiple connected components. For example, each of the terminals 224 and 226 may include a planar sheet that is welded to the folded external connector tabs 310 and 410, respectively. Subsequently, an additional and relatively short planar portion may be welded to each planar sheet to provide each terminal 224 and 226 having an L-shape.
[0049] As described above, the stacked structure 240 may include any suitable number of external connector tabs 310 and 410. Figure 7 In the example of FIG. 2 , the stacked structure 240 includes a first group 312A / 314A, a second group 312B / 314B, and a third group 312C / 314C. The stacked structure 240 also includes a third group 312C / 314C and a fourth group 312D / 314D. The stacked structure 240 may include the following: Figure 7 External connector lugs 410 are shown in a similar arrangement.
[0050] Therefore, the present disclosure provides a prismatic battery cell configuration that can utilize the maximum area of the battery cell can. Since the plurality of second tabs 310B / 410B do not extend beyond the width W of the laminate structure 240 when folded, there is no need to fold back and / or tape the protruding tabs, which saves space. Folding the second tab 310B / 410B over the first tab 310A / 410A can reduce the overall size of the prismatic battery cell 200. The plurality of first tabs 310A / 410A can provide a buffer for the weld to prevent the weld from reaching the diaphragm 32. In the case where the weld reaches the plurality of first tabs 310A / 410A, the plurality of first tabs 310A / 410A can provide additional connections to pass current.
[0051] Some of the aspects explained above are summarized below by means of numbered examples.
[0052] Example 1. A battery cell comprising:
[0053] Laminated structure, comprising:
[0054] C cathode electrodes, each cathode electrode comprising a cathode current collector, a cathode active layer disposed on the cathode current collector, and an external connector extending from the cathode current collector;
[0055] A anode electrodes, each anode electrode comprising an anode current collector, an anode active layer disposed on the anode current collector, and an external connector extending from the anode current collector; and
[0056] S diaphragms, wherein C, A, and S are integers greater than one; and
[0057] a first internal terminal;
[0058] Wherein, each of the external connectors of the C cathode electrodes and one of the A anode electrodes includes a first terminal tab and a second terminal tab extending farther than the first terminal tab, the second terminal tab is folded onto the first terminal tab, and the first internal terminal is laser welded to the second terminal tab.
[0059] Example 2. The battery cell according to Example 1, wherein N of the second terminal tabs are folded onto R of the first terminal tabs, N and R are integers, wherein N is equal to or greater than R.
[0060] Example 3. The battery cell according to Example 1, wherein the first tab is folded toward the second tab.
[0061] Example 4. The battery cell of Example 1, wherein each of the second tabs has a maximum length that is less than or equal to half the width of the stacked structure.
[0062] Example 5. The battery cell according to Example 1, wherein:
[0063] The first group of first connecting tabs is adjacent to the first group of second connecting tabs, and the first group of second connecting tabs is folded onto the first group of first connecting tabs in a first direction; and
[0064] The second group of first connecting tabs is adjacent to the second group of second connecting tabs, and the second group of second connecting tabs is folded onto the second group of first connecting tabs along a second direction, and the second direction is opposite to the first direction.
[0065] Example 6. The battery cell according to Example 5, wherein:
[0066] The first set of first tabs is laterally spaced apart and aligned with the second set of second tabs in a third direction perpendicular to both the first direction and the second direction; and
[0067] The first set of second tabs are laterally spaced apart and aligned with the second set of first tabs in the third direction.
[0068] Example 7. The battery cell according to Example 1, further comprising a second internal terminal:
[0069] In which, each of the external connectors of the C cathode electrodes and the other electrodes among the A anode electrodes includes a third terminal tab and a fourth terminal tab longer than the third terminal tab, the fourth terminal tab is folded onto the third terminal tab, and the second internal terminal is laser welded to the fourth terminal tab.
[0070] Example 8. The battery cell according to Example 7, wherein:
[0071] The first group of third connecting tabs is adjacent to the first group of fourth connecting tabs, and the first group of fourth connecting tabs is folded onto the first group of third connecting tabs in a first direction; and
[0072] The second group of third connecting tabs faces the second group of fourth connecting tabs, and the second group of fourth connecting tabs is folded onto the second group of third connecting tabs along a second direction, and the second direction is opposite to the first direction.
[0073] Example 9. The battery cell of Example 7, wherein the first internal terminal and the second internal terminal are located on opposite ends of the stacked structure.
[0074] Example 10. The battery cell according to Example 9, further comprising:
[0075] shell;
[0076] a first external terminal in contact with the first internal terminal; and
[0077] A second external terminal is in contact with the second internal terminal.
[0078] Example 11. A battery cell comprising:
[0079] Laminated structure, comprising:
[0080] C cathode electrodes, each cathode electrode comprising a cathode current collector, a cathode active layer disposed on the cathode current collector, and an external connector extending from the cathode current collector;
[0081] A anode electrodes, each anode electrode comprising an anode current collector, an anode active layer disposed on the anode current collector, and an external connector extending from the anode current collector; and
[0082] S diaphragms, wherein C, A, and S are integers greater than one; and
[0083] a first internal terminal;
[0084] Wherein, for one of the C cathode electrodes and the A anode electrodes, the external connector comprises:
[0085] a plurality of first terminal tabs and a plurality of second terminal tabs extending further than the plurality of first terminal tabs;
[0086] a first plurality of first tabs and a first plurality of second tabs, the first plurality of second tabs being folded onto the first plurality of first tabs along a first direction;
[0087] a second plurality of first tabs and a second plurality of second tabs, the second plurality of second tabs being folded onto the second plurality of first tabs in a second direction, the second direction being opposite to the first direction; and
[0088] The first inner terminal is laser welded to the first plurality of second terminal tabs and the second plurality of second terminal tabs.
[0089] Example 12. The battery cell according to Example 11, wherein:
[0090] The first plurality of first tabs are laterally spaced apart and aligned with the second plurality of second tabs; and
[0091] The first plurality of second lugs is laterally spaced apart from and aligned with the second plurality of first lugs.
[0092] Example 13. The battery cell according to Example 11, wherein:
[0093] the first plurality of first tabs being folded toward the first plurality of second tabs; and
[0094] The second plurality of first tabs is folded toward the second plurality of second tabs.
[0095] Example 14. The battery cell according to Example 11, further comprising a second internal terminal;
[0096] Wherein, for the other electrodes among the C cathode electrodes and the A anode electrodes, the external connector includes:
[0097] a plurality of first terminal tabs and a plurality of second terminal tabs extending further than the plurality of first terminal tabs;
[0098] a first plurality of first tabs and a first plurality of second tabs, the first plurality of second tabs being folded onto the first plurality of first tabs along a first direction;
[0099] a second plurality of first tabs and a second plurality of second tabs, the second plurality of second tabs being folded onto the second plurality of first tabs in a second direction, the second direction being opposite to the first direction; and
[0100] The second inner terminal is laser welded to the first plurality of second terminal tabs and the second plurality of second terminal tabs.
[0101] Example 15. The battery cell of Example 11, wherein each of the plurality of second tabs has a maximum length that is less than or equal to half a width of the stacked structure.
[0102] Example 16. A method for manufacturing a battery cell, comprising:
[0103] A laminated structure is provided, comprising:
[0104] C cathode electrodes, each cathode electrode comprising a cathode current collector, a cathode active layer disposed on the cathode current collector, and an external connector extending from the cathode current collector;
[0105] A anode electrodes, each anode electrode comprising an anode current collector, an anode active layer disposed on the anode current collector, and an external connector extending from the anode current collector;
[0106] a first plurality of first terminal tabs and a first plurality of second terminal tabs, the first plurality of first terminal tabs and the first plurality of second terminal tabs being included together with the external connector of one of the C cathode electrodes and the A anode electrodes, the plurality of second terminal tabs extending further than the plurality of first terminal tabs; and
[0107] S diaphragms, wherein C, A, and S are integers greater than one;
[0108] folding the first plurality of second tabs onto the first plurality of first tabs in a first direction; and
[0109] The first inner terminal is laser welded to the first plurality of second terminal tabs.
[0110] Example 17. The method of Example 16, further comprising folding the first plurality of first tabs toward the first plurality of second tabs in a second direction opposite to the first direction;
[0111] Wherein, after or while folding the first plurality of first connecting tabs along the second direction, the first plurality of second connecting tabs are folded onto the first plurality of first connecting tabs.
[0112] Example 18. The method according to Example 16, further comprising:
[0113] Providing a stacked structure including a third group of a plurality of third terminal tabs and a fourth group of a plurality of fourth terminal tabs, the third group of a plurality of third terminal tabs and the fourth group of a plurality of fourth terminal tabs being included together with external connectors of other electrodes among the C cathode electrodes and the A anode electrodes, the plurality of fourth terminal tabs extending further than the plurality of third terminal tabs;
[0114] folding the fourth plurality of fourth tabs onto the third plurality of third tabs; and
[0115] The second inner terminal is laser welded to the fourth plurality of fourth terminal tabs.
[0116] Example 19. The method according to Example 18, further comprising folding the third plurality of third tabs toward the fourth group;
[0117] Wherein, after folding the third group toward the fourth group, the fourth group is folded onto the third group.
[0118] Example 20. The method of Example 16, wherein each of the plurality of second tabs has a maximum length that is less than or equal to half a width of the stacked structure.
[0119] The foregoing description is essentially illustrative only, and there is no intention to limit the present disclosure, its application or use. The broad teachings of the present disclosure can be implemented in various forms. Therefore, although the present disclosure includes specific examples, the true scope of the present disclosure should not be limited thereto, because after studying the drawings, the specification and the appended claims, other modifications can be made apparent. It should be understood that one or more steps in the method can also be performed in different orders (or simultaneously) without changing the principles of the present disclosure. In addition, although each of the embodiments is described above as having certain features, any one or more of those features described with reference to any embodiment of the present invention can also be implemented in the features of any of the other embodiments and / or combined with the features of any of the other embodiments, even if the combination is not explicitly described. In other words, the described embodiments are not mutually exclusive, and the permutation of one or more embodiments to each other remains within the scope of the present disclosure.
[0120] Various terms are used to describe the spatial and functional relationships between elements (e.g., between modules, circuit elements, semiconductor layers, etc.), including "connected," "engaged," "coupled," "adjacent," "next to," "on top," "above," "below," and "disposed." Unless explicitly described as "direct," when describing the relationship between a first and a second element in the above disclosure, the relationship can be a direct relationship in which there are no other intermediate elements between the first and second elements, but can also be an indirect relationship in which there are one or more intermediate elements (spatially or functionally) between the first and second elements. As used herein, the phrase at least one of A, B, and C should be interpreted as meaning a logical (A or B or C) using a non-exclusive logical "or," and should not be interpreted as meaning "at least one of A, at least one of B, and at least one of C."
[0121] In the drawings, the direction of the arrow, as indicated by the arrow, generally represents the flow of information (e.g., data or instructions) of interest to the illustration. For example, when component A and component B exchange various information, but the information transmitted from component A to component B is relevant to the illustration, the arrow may point from component A to component B. The unidirectional arrow does not imply that no other information is transmitted from component B to component A. In addition, for information sent from component A to component B, component B may also send a request for the information or a confirmation of receipt of the information to component A.
Claims
1. A battery cell, comprising: Laminated structure, comprising: C cathode electrodes, each cathode electrode comprising a cathode current collector, a cathode active layer disposed on the cathode current collector, and an external connector extending from the cathode current collector; A anode electrodes, each anode electrode comprising an anode current collector, an anode active layer disposed on the anode current collector, and an external connector extending from the anode current collector; and S diaphragms, wherein C, A, and S are integers greater than one; and a first internal terminal; Wherein, each of the external connectors of the C cathode electrodes and one of the A anode electrodes includes a first terminal tab and a second terminal tab extending farther than the first terminal tab, the second terminal tab is folded onto the first terminal tab, and the first internal terminal is laser welded to the second terminal tab.
2. The battery cell according to claim 1, wherein: N of the second connecting pieces are folded onto R of the first connecting pieces, where N and R are integers, and N is equal to or greater than R.
3. The battery cell according to claim 1, wherein: The first terminal tab is folded toward the second terminal tab.
4. The battery cell according to claim 1, wherein: Each of the second tabs has a maximum length that is less than or equal to half the width of the stacked structure.
5. The battery cell according to claim 1, wherein: The first group of first connecting tabs is adjacent to the first group of second connecting tabs, and the first group of second connecting tabs is folded onto the first group of first connecting tabs in a first direction; as well as The second group of first connecting tabs is adjacent to the second group of second connecting tabs, and the second group of second connecting tabs is folded onto the second group of first connecting tabs along a second direction, and the second direction is opposite to the first direction.
6. The battery cell according to claim 5, wherein: The first set of first tabs is laterally spaced apart and aligned with the second set of second tabs in a third direction perpendicular to both the first direction and the second direction; as well as The first set of second tabs are laterally spaced apart and aligned with the second set of first tabs in the third direction.
7. The battery cell of claim 1, further comprising a second internal terminal: in, Each of the external connectors of the C cathode electrodes and the other electrodes of the A anode electrodes includes a third terminal and a fourth terminal that is longer than the third terminal, the fourth terminal is folded onto the third terminal, and the second internal terminal is laser welded to the fourth terminal.
8. The battery cell according to claim 7, wherein: The first group of third connecting pieces is adjacent to the first group of fourth connecting pieces, and the first group of fourth connecting pieces is folded onto the first group of third connecting pieces in a first direction; as well as The second group of third connecting tabs faces the second group of fourth connecting tabs, and the second group of fourth connecting tabs is folded onto the second group of third connecting tabs along a second direction, and the second direction is opposite to the first direction.
9. The battery cell according to claim 7, wherein: The first inner terminal and the second inner terminal are located on opposite ends of the stacked structure.
10. The battery cell according to claim 9, further comprising: shell; a first external terminal in contact with the first internal terminal; as well as A second external terminal is in contact with the second internal terminal.